diff --git a/app/utils/db_migrate.py b/app/utils/db_migrate.py
index c84da88d..78f87fca 100644
--- a/app/utils/db_migrate.py
+++ b/app/utils/db_migrate.py
@@ -12,6 +12,7 @@ The utility:
 """
 
 import logging
+import re
 from typing import Any
 
 from sqlalchemy import MetaData, create_engine, inspect, text
@@ -84,6 +85,9 @@ def preview_migration(source_url: str) -> dict[str, Any]:
         total = 0
         with src_engine.connect() as conn:
             for table_name in tables:
+                if not re.match(r"^[a-zA-Z0-9_]+$", table_name):
+                    logger.warning(f"Skipping table with invalid name format: {table_name}")
+                    continue
                 # table_name is safe — sourced from inspect().get_table_names(), not user input
                 quoted_table = conn.dialect.identifier_preparer.quote(table_name)
                 row = conn.execute(text(f"SELECT COUNT(*) FROM {quoted_table}")).fetchone()  # noqa: S608